Figure F7. Estimates of absolute abundance of smectite in bulk mudstone, Sites 1173, 1174, and 1177. To compare coeval strata, depths are relative to the top of the Shikoku Basin facies. Estimates were made by multiplying the weight percent total clay minerals (from Shipboard Scientific Party, 2001c, 2001d, 2001e) by the abundance of smectite relative to illite and chlorite (+ kaolinite) in the <2-µm size fraction.

Figure F7. Estimates of absolute abundance of smectite in bulk mudstone, Sites 1173, 1174, and 1177. To compare coeval strata, depths are relative to the top of the Shikoku Basin facies. Estimates were made by multiplying the weight percent total clay minerals (from Shipboard Scientific Party, 2001c, 2001d, 2001e) by the abundance of smectite relative to illite and chlorite (+ kaolinite) in the <2-µm size fraction.